Apple's Mac Pro is now shipping within three to five weeks in the United States, a slight improvement from its previous shipping estimate of four to five weeks



From MacRumors:

Both stock and custom configurations list the same shipping estimates, indicating that Apple is slowly making its way towards achieving supply/demand balance on the professional desktop computers. In early April, shipping estimates were as high as five to six weeks and back in early 2014, shipping estimates were as high as eight weeks, with Apple giving estimates of "March" or "April" for computers ordered in January or February.

  Mac Pro Shipping Estimates Improve to 3 to 5 Weeks